Lena and Saheed have never met; they probably never will. Lena lives in 2050 Leipzig, a placid and historic German city of middle-aged professionals. At 51, she is midway through a career as a pharmacist, with retirement more than two decades away. She and her husband no longer have to support their only child, a daughter who recently graduated from college, but they worry about caring for their aging parents, who are in fairly good health in their 80s and 90s. Saheed, unattached and unemployed at 22, lives in a decrepit slum on the outskirts of Lagos, Nigeria, where he is one of four siblings. He and his brothers and sisters face a very different kind of struggle: finding jobs in a tight labor market overrun with young workers, along with obtaining housing and clean water.